KEP-3314: adding beta PRR documentation

[carlbraganza]

• One-line PR description: Update KEP-3314 PRR for Beta.

• Issue link: CSI Differential Snapshot for Block Volumes #3314

• Other comments:

[k8s-ci-robot]

Hi @carlbraganza. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[xing-yang]

/ok-to-test

[xing-yang]

You need to update https://github.com/kubernetes/enhancements/blob/master/keps/sig-storage/3314-csi-changed-block-tracking/kep.yaml and https://github.com/kubernetes/enhancements/blob/master/keps/prod-readiness/sig-storage/3314.yaml

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: carlbraganza
Once this PR has been reviewed and has the lgtm label, please assign jpbetz, jsafrane for approval. For more information see the Code Review Process.

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Needs approval from an approver in each of these files:

• keps/prod-readiness/OWNERS
• keps/sig-storage/OWNERS

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[xing-yang]

General comment: Please provide more details when you say "CSI driver specific."

For e2e tests, please include links to the test files.